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authorJoseph Myers <joseph@codesourcery.com>2015-10-28 18:50:20 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-10-28 18:50:20 +0000
commit0b9af583a5c2d68085e88cece13952bf05dc4882 (patch)
treeefc4a66a9b018447c371749d91cf8a5b8508754f /math/test-fenv-clear-main.c
parenteae6c382bdca2e7ac582a69d56c9c228b678ee67 (diff)
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Fix i386/x86_64 fesetenv SSE exception clearing (bug 19181).
The i386 and x86_64 versions of fesetenv, when called with FE_DFL_ENV or FE_NOMASK_ENV as argument, do not clear SSE exceptions raised in MXCSR. These arguments should, like other fenv_t values, represent the whole of the floating-point state, so such exceptions should be cleared; this patch adds the required clearing. (Discovered while working on bug 16068.) Tested for x86_64 and x86. [BZ #19181] * sysdeps/i386/fpu/fesetenv.c (__fesetenv): Clear already-raised SSE exceptions when argument is FE_DFL_ENV or FE_NOMASK_ENV. * sysdeps/x86_64/fpu/fesetenv.c (__fesetenv): Likewise. * math/test-fenv-clear-main.c: New file. * math/test-fenv-clear.c: Likewise. * math/Makefile (tests): Add test-fenv-clear. * sysdeps/x86/fpu/test-fenv-clear-sse.c: New file. * sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add test-fenv-clear-sse. [$(subdir) = math] (CFLAGS-test-fenv-clear-sse.c): New variable.
Diffstat (limited to 'math/test-fenv-clear-main.c')
-rw-r--r--math/test-fenv-clear-main.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/math/test-fenv-clear-main.c b/math/test-fenv-clear-main.c
new file mode 100644
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+++ b/math/test-fenv-clear-main.c
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+/* Test fesetenv (FE_DFL_ENV) and fesetenv (FE_NOMASK_ENV) clear
+ exceptions (bug 19181).
+ Copyright (C) 2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <fenv.h>
+#include <float.h>
+#include <stdio.h>
+
+volatile float fa = 1.0f, fb = 0.0f, fc = FLT_MAX, fr;
+volatile long double lda = 1.0L, ldb = 0.0L, ldc = LDBL_MAX, ldr;
+
+static void
+raise_exceptions (void)
+{
+ /* Raise exceptions both with feraiseexcept and arithmetic to allow
+ for case of multiple floating-point units with separate
+ exceptions state. */
+ feraiseexcept (FE_ALL_EXCEPT);
+ fr = fb / fb;
+ fr = fa / fb;
+ fr = fc * fc;
+ fr = fa / fc / fc;
+ ldr = ldb / ldb;
+ ldr = lda / ldb;
+ ldr = ldc * ldc;
+ ldr = lda / ldc / ldc;
+}
+
+static __attribute__ ((noinline)) int
+run_tests (void)
+{
+ int result = 0;
+ raise_exceptions ();
+ if (fesetenv (FE_DFL_ENV) == 0)
+ {
+ puts ("PASS: fesetenv (FE_DFL_ENV)");
+ if (fetestexcept (FE_ALL_EXCEPT) == 0)
+ puts ("PASS: fesetenv (FE_DFL_ENV) clearing exceptions");
+ else
+ {
+ puts ("FAIL: fesetenv (FE_DFL_ENV) clearing exceptions");
+ result = 1;
+ }
+ }
+ else
+ {
+ puts ("FAIL: fesetenv (FE_DFL_ENV)");
+ result = 1;
+ }
+#ifdef FE_NOMASK_ENV
+ raise_exceptions ();
+ if (fesetenv (FE_NOMASK_ENV) == 0)
+ {
+ if (fetestexcept (FE_ALL_EXCEPT) == 0)
+ puts ("PASS: fesetenv (FE_NOMASK_ENV) clearing exceptions");
+ else
+ {
+ puts ("FAIL: fesetenv (FE_NOMASK_ENV) clearing exceptions");
+ result = 1;
+ }
+ }
+ else
+ puts ("fesetenv (FE_NOMASK_ENV) failed, cannot test");
+#endif
+ return result;
+}
+
+static int
+do_test (void)
+{
+ CHECK_CAN_TEST;
+ return run_tests ();
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"